Investigation number
198703480
Occurrence date
Location
14 km SE Gympie
Report release date
Report status
Final
Investigation type
Occurrence Investigation
Investigation status
Completed
Occurrence class
Accident
Highest injury level
None
The pilot reported that the helicopter was cruising at 2000 feet when, without warning, there was a complete loss of engine power. During the subsequent forced landing, the tail boom struck the ground, causing the tail rotor gear box to separate from the aircraft. Investigation revealed that the engine accessory gear train had failed, causing both magnetos to cease operation. The gear train failed due to lack of torque followed by the fatigue failure of six screws that attach the accessory drive gear to the starter gear. The cause of the loss of torque was not established.
Aircraft Details
Manufacturer
Hiller Aviation
Model
UH-12
Registration
VH-FFX
Serial number
5066
Operation type
Business
Departure point
Caloundra QLD
Departure time
1420
Destination
Rockhampton QLD
Damage
Substantial